Mining-drill



(No Model.) 3'Sheets-Sheet 1.

R. H. ELLIOTT & J. B. CAR'RINGTON.

` MINING DRILL.

N0.`530,512. Patented Deo. 11, 1894.

3 Sheets-Sheet 2. R. H. vELLIOTT 8# J'. B. CARRINGTON.

l (Np Moae1.

MINING DRILL.

9 l ,w m .lkml l. 1 mr/// c. g m M auf D1 2. m? m W 5 N Y w Q (N0 Model.) 3 Sheets-Sheet 3.

R. H; E`LL10TT& J..B. GARRINGTON.

MINING DRILL. I

` Patented Dec. 11,1894. y

nlnl'" 4iilillmm N #UNITED STATES ROBERT H. ELLIOTT, OF

PATENT OFFICE.

EIEMINGHAMANo Jol-IN E. oAEmNeToN, or

JASPER, ALABAMA.

MINING-DRILL. y

SPECIFICATION forming part of Letters Patent No. 530,512, dated December 11, 1894...

Application led April 26, 1894. Serial No. 509.096. (No model.) l

To all whom it may concern.'

Be it known that we, ROBERT H. ELLIOTT, residing at Birmingham, in the county of Jefferson, and JOHN B. CARRINGTON, residing at Jasper, in the county ofWalker, State of Alahama, have invented certain new and useful Improvements in Mining-Drills; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in mining drills, and especially relates to drills used in mining coal and similar material. which is not too hard, for the cutting instrument.

Our invention relates to improved apparatus for making enlarged pockets or. chambers at or near the end of a boring for the purpose of obtaining an improved eect from a small charge of blasting material, and it- ,con-

' sists of certain novel features hereinafter described and claimed. l Reference is had to the accompanying drawings wherein the same parts are indicated by the same letters. p

Figure l represents a side elevation of the ldrill when worked by hand, and shows it in roperative position at the end of a heading in a coal mine. Fig. 2 represents an enlarged longitudinal section of the inner end of the drill.

Fig. 3 represents a central longitudinal section of the xdevice shown inFig. 2. Fig. 4 represents a section along the liney y of Figs. 2 and 3, and looking to the right, and Fig. 5 represents a section along the line oc oo of Figs. 2 and 3. Fig. 6 represents a sectional elevation of a modified form of drill, operated by air, and shows a method of forcing outward the cutting wing, and also of blowing out the chips or cuttings by the force of the compressedair. Fig. 7 represents a detailed longitudinal section of the air inlet, and Fig. 8 represents a cross section of the device shown in Fig. 7. y

Arepresents the end of aheading in which A and A2 are the roof and foot-walls. `A hole ais bored in this heading at any desired portion thereof, and at any desired.angle,and the purpose of this invention is to enlarge the end of this hole a into a pocket or chamber a capable of receiving and of economically firing the charge of powder or other blasting maf terial. A tube C is mounted ona jack-post B of ordinary construction, or is mounted in any other convenient way in the heading. This tube may be either open at its inner end as shown in Fig. 6, or is revolubly connected by means of a rivet c to the holding cap O which bites into the material and steadies the tube in position while it is revolving. This tube is revolved in any convenient way, as by means of the bevel gears D and E andhand crank F, as shown in Fig. l, or by means of the gears D and E operated by air pressure or other force, as shown in Fig. 6, there being a great variety of ways, wel] known to the skilled mechanic in which the said tube may be suitablyrevolved. Pivoted in this tube C and near the inner en d thereof, we provide a cuttingwing H preferablyof the construction shown" in-Figs. 2 to 4, in which ,y form of .con-

struction the wing H is pivoted at El in the tube, is provided with a cutting point h2, and cutting edges h', between which a guide groove 72.0 is provided. This guide groove `has preferably a sloping bottom h3 up which the cutting block M is caused to slide, as will `be hereinafterdescribed.

The wing l-l is swungabout the pivot Hby means of Vthe linkK pivoted to the said wing at oyand to the sliding tube .K at 7c. This tube K is mounted in the tube C, and is normallypressed forward by the spring L held under compression between the loose collar L mounted on the rodlVI, and the end of the said `tube K. `This loose 'collar L' is held against motion backward by the clip'c4 attached to the end of the strap G4, which is pivoted at c5 tothe end of the revolving tube It will be seen that the spring L will tendto press the tube K forward, and so press the wing H outward between the sides of the slot o near the end of the tube O.

When it is desired to withdrawV the tube O from the boring, by releasing the clip c4 and IOO the yielding pressure of the springL will enable the said wing H to yield to pressure inward should obstructions occur in the mineral being mined. In addition to the cutting effect of this wing I-l, an auxiliary cutter M' sliding longitudinally along the wing H is employed. This cutting block M' is provided with a cutting point m2 projecting beyond the cutting edges h' of the wing H, while the said block is pressed forward-or drawn backward by means of the links m connected to the squared portion m of the rod M. This rod M passes out to the rear of the tube C, being revolubly mounted in the tube K, and also in the spring L, loose collar L', and clip c4. The rear end of this rod M terminatesin a handle M0, and the block M' is caused to move up and down in the guide groove ho in the wing H by simply pressing forward or drawing back on this handle M0. A hand wheel might be substituted for the handle M0 if preferred. It will be noted that as this block M is gradually pressed outward on the wing H, it will cut a series of helicoidal grooves on the conical surface of the chamber A. These grooves are shown at a2 in Fig. l. It will also be noted that should this cutter M strike too hard material to be cut thereby, it will bear down on the wing H, which will, owing to the elasticity of the spring L, yield sufficiently to prevent the cutter M' from being broken by the revolution of the tube O.

An air blast may be used to blow air through the tube and through the opening c as shown in dotted lines at Q and Q in Fig. l, and as described fully with reference to Figs. 6 to 8. In these latter figures for clearness in the drawings, a solid wing H2 with cutting points ha is shown, but the wing H and movable cutter M', shown in Figs. 2 to 4 might be used with the other apparatus described in relation to Figs. 6 to 8. In this form of the device the reamer is driven by an air engine connected to the bevel gear E'. In these figures P represents a pipe connected at one end to a compressed air chamber, not shown, which is also the air reservoir for the engine, and revolubly connected at the other end, as at p, to the revolving tube C. Mounted in this tube C is the piston R Whose piston rod R' is bent downward at its forward end, passses through a guide clip fr, and terminates in a rounded head fr adapted to bear against the rear face h" of the Wing H2. This piston R' corresponds with the tube K and link K' shown in Fig. 2. Forward of this piston R, a pipe Q for the escape air from the engine is connected to a chamber Q inclosing the pipe C which revolves freely within said chamber. Port co connects this escape air pipe Q with the interior of the revolving pipe C. It will be seen that the air pressure on the piston R will tend to press the wing H2 outward, and will aord a' yielding pressure thereto, which the escape air rushing in at the port o0 at a reduced pressure will not b sufficient to counterbalance the pressure of the air on the piston R, and yet will be sufficient to escape through the slot c and the end of the tube C with such force as to carry out the chips through the open end of the boring ct.

It will be obvious that a rwing similar to that shown in Fig. 2 may be used with the other apparatus shown in Figs. 6 to 8, and also that an auxiliary cutter M', such as is shown in Fig. 2 might be added if desired.

In order to draw back the cutter H2, the air pressure should be cut off from the pipe P and the pressure of the escape air acting unbalanced on the forward end of the piston will force back the same with sufficientforce.

It will be obvious that various modifications of the herein described devices might be made which could be used without departing from the spirit of our invention.

Having thus described our invention, what we claim, and desire to secure by Letters Patent ot the United States, is-

l. In a mining drill of the character described, the combination with a rotating tube slotted near the forward end thereof, of a wing pivoted in said tube and adapted to swing outward through said slot, the said wing being provided with a longitudinal groove therein, an auxiliary cutter moving in said groove, and means for pressing said wing outward, substantially as described.

2. In a mining drill of the character described, the combination with a spindle or drill body and means for rotating the same, of an extensory wing provided with a guide way therein, and an auxiliary cutter moving in said guideway, substantially as described.

3. In a mining drill of the character described, the combination with a spindle or drill body and means for rotating the same, of an extensory wing provided with an inclined longitudinal guideway therein, an auxiliary cutter mounted in said guideway, and means for moving said cutter backward and forward, substantially as and for the purposes described.

4. In a mining drill of the character described, the combination with a rotary spindleor drill body, of an extensory wing pivoted thereto and provided with a guideway therein, a yielding elastic device for pressing said wing outward, an auxiliary cutter moving in said guideway, and means for moving said cutter backward and forward, substantially as described.

6. In a mining drill of the character described, the combination with a rotary tube slotted near the forward end thereof, of an extensory wing pivoted in said tube and adapted to swing outward through said slot, the said wing being provided with a guideway therein, an auxiliary cutter mounted in said guideway, a rod movable longitudinally in said tube, and links connecting said rod and said auxiliary cutter, substantially as and for the purposes described.

6. In a mining drill of the character de= IOC IIO

a scribed, the combination with a spindle or drill body and means for rotating the same, of an extensory wing provided with a guide way therein, means for swinging said wing outward about its pivot, and an auxiliary cutter mounted in said guideway, and means for moving said auxiliary cutter, substantially as described.

7. In a mining drill of the character described, the combination with a rotating tube slotted near the forward end thereof, of a wing pivoted in said tube and adapted to swing outward through said slot, the said wing being provided with a longitudinal groove therein, an auxiliary cutter mounted in said groove, a yielding elastic device for pressing said wing outward, a rod extending inwardly into said tube and projecting from the rear thereof, and links connecting said rodwith said auxiliary cutter, substantially as and for the purposes described.

8. In a mining drill of the character described, the combination with a spindle or drill body and means for rotating the same, of an extensory wing provided with a longi` `tudinal guideway therein, an auxiliary cutter mounted in said guideway, and a rod and flexible connection between itand said cutter for moving said cutter backward and forward in said guideway, substantially as and for the purposes described.

9. In a mining drill of the character `described, the combination with a spindle or drill body and means for rotating the same of an extensory wing provided with a longitudinal guideway therein with bottom sloping as shown, an auxiliary cutter mounted in said guideway, and adapted to move up said inclined bottom of said guideway, and a rod and a flexible connection between it and said Ycutter for moving said cutter backward and forward in said guideway, substantially as and for the purposes described. r

10. In a mining drill of the character described, the combination with a rotary tube slotted near the forwardend thereof, of an extensory wing pivotcd in said tube and adapted to swing outward through said slot, the said wing being provided with a guideway therein, an auxiliary cutter mounted in said guideway, a rod movable longitudinally in said tube, links connecting said rods and said auxiliary cutter, and an air blast passing through -said tube for carrying off the chips or cutpassing through said tube for carrying oft the chips or cuttings, substantially as and for the purposes described.

In testimony whereof we affix our signatures in presence of` two witnesses.

` ROBERT H. ELLIOTT.

JOHN B. OARRINGTON.`

` Witnesses:

` W. G. ROBINSON, J. B. ROBINSON. 

